Finding the Fourth Proportional to 56,621.91, 78,136.32 and 31,470.87

Step by Step Solution

1. Step 1: Write the proportion equation
   56,621.91 : 78,136.32 = 31,470.87 : x
2. Step 2: Convert to fraction form
   56,621.91/78,136.32 = 31,470.87/x
3. Step 3: Cross multiply
   56,621.91x = 78,136.32 × 31,470.87
4. Step 4: Simplify right side
   56,621.91x = 2,459,017,969.00
5. Step 5: Solve for x
   x = 2,459,017,969.00/56,621.91
6. Step 6: Final answer
   x = 43,428.74