Finding the Fourth Proportional to 56,939.31, 78,576.30 and 31,788.81

Step by Step Solution

1. Step 1: Write the proportion equation
   56,939.31 : 78,576.30 = 31,788.81 : x
2. Step 2: Convert to fraction form
   56,939.31/78,576.30 = 31,788.81/x
3. Step 3: Cross multiply
   56,939.31x = 78,576.30 × 31,788.81
4. Step 4: Simplify right side
   56,939.31x = 2,497,847,071.20
5. Step 5: Solve for x
   x = 2,497,847,071.20/56,939.31
6. Step 6: Final answer
   x = 43,868.59