Finding the Fourth Proportional to 56,810.28, 78,401.61 and 31,316.61

Step by Step Solution

1. Step 1: Write the proportion equation
   56,810.28 : 78,401.61 = 31,316.61 : x
2. Step 2: Convert to fraction form
   56,810.28/78,401.61 = 31,316.61/x
3. Step 3: Cross multiply
   56,810.28x = 78,401.61 × 31,316.61
4. Step 4: Simplify right side
   56,810.28x = 2,455,272,643.74
5. Step 5: Solve for x
   x = 2,455,272,643.74/56,810.28
6. Step 6: Final answer
   x = 43,218.81