Finding the Fourth Proportional to 56,878.31, 78,494.50 and 31,727.81

Step by Step Solution

1. Step 1: Write the proportion equation
   56,878.31 : 78,494.50 = 31,727.81 : x
2. Step 2: Convert to fraction form
   56,878.31/78,494.50 = 31,727.81/x
3. Step 3: Cross multiply
   56,878.31x = 78,494.50 × 31,727.81
4. Step 4: Simplify right side
   56,878.31x = 2,490,458,817.94
5. Step 5: Solve for x
   x = 2,490,458,817.94/56,878.31
6. Step 6: Final answer
   x = 43,785.74