Finding the Fourth Proportional to 139,401,483.69, 209,074,669.30 and 132,488,289.21

Step by Step Solution

1. Step 1: Write the proportion equation
   139,401,483.69 : 209,074,669.30 = 132,488,289.21 : x
2. Step 2: Convert to fraction form
   139,401,483.69/209,074,669.30 = 132,488,289.21/x
3. Step 3: Cross multiply
   139,401,483.69x = 209,074,669.30 × 132,488,289.21
4. Step 4: Simplify right side
   139,401,483.69x = 27,699,945,252,703,508
5. Step 5: Solve for x
   x = 27,699,945,252,703,508/139,401,483.69
6. Step 6: Final answer
   x = 198,706,244.15