Finding the Fourth Proportional to 56,470.50, 77,931.72 and 31,320

Step by Step Solution

1. Step 1: Write the proportion equation
   56,470.50 : 77,931.72 = 31,320 : x
2. Step 2: Convert to fraction form
   56,470.50/77,931.72 = 31,320/x
3. Step 3: Cross multiply
   56,470.50x = 77,931.72 × 31,320
4. Step 4: Simplify right side
   56,470.50x = 2,440,821,470.40
5. Step 5: Solve for x
   x = 2,440,821,470.40/56,470.50
6. Step 6: Final answer
   x = 43,222.95