Finding the Fourth Proportional to 72,164,139.57, 108,240,561.50 and 20,346,649.20

Step by Step Solution

1. Step 1: Write the proportion equation
   72,164,139.57 : 108,240,561.50 = 20,346,649.20 : x
2. Step 2: Convert to fraction form
   72,164,139.57/108,240,561.50 = 20,346,649.20/x
3. Step 3: Cross multiply
   72,164,139.57x = 108,240,561.50 × 20,346,649.20
4. Step 4: Simplify right side
   72,164,139.57x = 2,202,332,733,949,792.50
5. Step 5: Solve for x
   x = 2,202,332,733,949,792.50/72,164,139.57
6. Step 6: Final answer
   x = 30,518,381.39