Finding the Fourth Proportional to 56,639.79, 78,164.18 and 31,144.54

Step by Step Solution

1. Step 1: Write the proportion equation
   56,639.79 : 78,164.18 = 31,144.54 : x
2. Step 2: Convert to fraction form
   56,639.79/78,164.18 = 31,144.54/x
3. Step 3: Cross multiply
   56,639.79x = 78,164.18 × 31,144.54
4. Step 4: Simplify right side
   56,639.79x = 2,434,387,386.17
5. Step 5: Solve for x
   x = 2,434,387,386.17/56,639.79
6. Step 6: Final answer
   x = 42,980.16