Finding the Fourth Proportional to 139,401,493.20, 209,074,683.57 and 132,488,298.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,401,493.20 : 209,074,683.57 = 132,488,298.72 : x
2. Step 2: Convert to fraction form
   139,401,493.20/209,074,683.57 = 132,488,298.72/x
3. Step 3: Cross multiply
   139,401,493.20x = 209,074,683.57 × 132,488,298.72
4. Step 4: Simplify right side
   139,401,493.20x = 27,699,949,131,611,636
5. Step 5: Solve for x
   x = 27,699,949,131,611,636/139,401,493.20
6. Step 6: Final answer
   x = 198,706,258.42