Finding the Fourth Proportional to 139,020,139.80, 208,604,859.30 and 58,249,272.60

Step by Step Solution

1. Step 1: Write the proportion equation
   139,020,139.80 : 208,604,859.30 = 58,249,272.60 : x
2. Step 2: Convert to fraction form
   139,020,139.80/208,604,859.30 = 58,249,272.60/x
3. Step 3: Cross multiply
   139,020,139.80x = 208,604,859.30 × 58,249,272.60
4. Step 4: Simplify right side
   139,020,139.80x = 12,151,081,315,050,346
5. Step 5: Solve for x
   x = 12,151,081,315,050,346/139,020,139.80
6. Step 6: Final answer
   x = 87,405,186.99