Finding the Fourth Proportional to 56,645.62, 78,171.86 and 31,153.10

Step by Step Solution

1. Step 1: Write the proportion equation
   56,645.62 : 78,171.86 = 31,153.10 : x
2. Step 2: Convert to fraction form
   56,645.62/78,171.86 = 31,153.10/x
3. Step 3: Cross multiply
   56,645.62x = 78,171.86 × 31,153.10
4. Step 4: Simplify right side
   56,645.62x = 2,435,295,225.14
5. Step 5: Solve for x
   x = 2,435,295,225.14/56,645.62
6. Step 6: Final answer
   x = 42,991.77