Finding the Fourth Proportional to 56,687.10, 78,228.90 and 31,196.40

Step by Step Solution

1. Step 1: Write the proportion equation
   56,687.10 : 78,228.90 = 31,196.40 : x
2. Step 2: Convert to fraction form
   56,687.10/78,228.90 = 31,196.40/x
3. Step 3: Cross multiply
   56,687.10x = 78,228.90 × 31,196.40
4. Step 4: Simplify right side
   56,687.10x = 2,440,460,055.96
5. Step 5: Solve for x
   x = 2,440,460,055.96/56,687.10
6. Step 6: Final answer
   x = 43,051.42