Finding the Fourth Proportional to 72,171,633.60, 99,598,146.48 and 39,132,997.20

Step by Step Solution

1. Step 1: Write the proportion equation
   72,171,633.60 : 99,598,146.48 = 39,132,997.20 : x
2. Step 2: Convert to fraction form
   72,171,633.60/99,598,146.48 = 39,132,997.20/x
3. Step 3: Cross multiply
   72,171,633.60x = 99,598,146.48 × 39,132,997.20
4. Step 4: Simplify right side
   72,171,633.60x = 3,897,573,987,327,030.50
5. Step 5: Solve for x
   x = 3,897,573,987,327,030.50/72,171,633.60
6. Step 6: Final answer
   x = 54,004,236.75