Finding the Fourth Proportional to 72,351.40, 99,848.01 and 42,131.85

Step by Step Solution

1. Step 1: Write the proportion equation
   72,351.40 : 99,848.01 = 42,131.85 : x
2. Step 2: Convert to fraction form
   72,351.40/99,848.01 = 42,131.85/x
3. Step 3: Cross multiply
   72,351.40x = 99,848.01 × 42,131.85
4. Step 4: Simplify right side
   72,351.40x = 4,206,781,380.12
5. Step 5: Solve for x
   x = 4,206,781,380.12/72,351.40
6. Step 6: Final answer
   x = 58,143.75