Finding the Fourth Proportional to 56,719.35, 78,272.69 and 31,574.79

Step by Step Solution

1. Step 1: Write the proportion equation
   56,719.35 : 78,272.69 = 31,574.79 : x
2. Step 2: Convert to fraction form
   56,719.35/78,272.69 = 31,574.79/x
3. Step 3: Cross multiply
   56,719.35x = 78,272.69 × 31,574.79
4. Step 4: Simplify right side
   56,719.35x = 2,471,443,591.61
5. Step 5: Solve for x
   x = 2,471,443,591.61/56,719.35
6. Step 6: Final answer
   x = 43,573.20