Finding the Fourth Proportional to 56,931.57, 78,565.28 and 31,781.07

Step by Step Solution

1. Step 1: Write the proportion equation
   56,931.57 : 78,565.28 = 31,781.07 : x
2. Step 2: Convert to fraction form
   56,931.57/78,565.28 = 31,781.07/x
3. Step 3: Cross multiply
   56,931.57x = 78,565.28 × 31,781.07
4. Step 4: Simplify right side
   56,931.57x = 2,496,888,504.34
5. Step 5: Solve for x
   x = 2,496,888,504.34/56,931.57
6. Step 6: Final answer
   x = 43,857.71