Finding the Fourth Proportional to 71,835.16, 99,134.78 and 39,572.12

Step by Step Solution

1. Step 1: Write the proportion equation
   71,835.16 : 99,134.78 = 39,572.12 : x
2. Step 2: Convert to fraction form
   71,835.16/99,134.78 = 39,572.12/x
3. Step 3: Cross multiply
   71,835.16x = 99,134.78 × 39,572.12
4. Step 4: Simplify right side
   71,835.16x = 3,922,973,410.33
5. Step 5: Solve for x
   x = 3,922,973,410.33/71,835.16
6. Step 6: Final answer
   x = 54,610.77