Finding the Fourth Proportional to 56,921.64, 78,551.51 and 31,429.59

Step by Step Solution

1. Step 1: Write the proportion equation
   56,921.64 : 78,551.51 = 31,429.59 : x
2. Step 2: Convert to fraction form
   56,921.64/78,551.51 = 31,429.59/x
3. Step 3: Cross multiply
   56,921.64x = 78,551.51 × 31,429.59
4. Step 4: Simplify right side
   56,921.64x = 2,468,841,301.46
5. Step 5: Solve for x
   x = 2,468,841,301.46/56,921.64
6. Step 6: Final answer
   x = 43,372.63