Finding the Fourth Proportional to 99,913, 137,883.90 and 57,471.48

Step by Step Solution

1. Step 1: Write the proportion equation
   99,913 : 137,883.90 = 57,471.48 : x
2. Step 2: Convert to fraction form
   99,913/137,883.90 = 57,471.48/x
3. Step 3: Cross multiply
   99,913x = 137,883.90 × 57,471.48
4. Step 4: Simplify right side
   99,913x = 7,924,391,801.17
5. Step 5: Solve for x
   x = 7,924,391,801.17/99,913
6. Step 6: Final answer
   x = 79,312.92