Finding the Fourth Proportional to 56,931.42, 78,564.96 and 31,439.37

Step by Step Solution

1. Step 1: Write the proportion equation
   56,931.42 : 78,564.96 = 31,439.37 : x
2. Step 2: Convert to fraction form
   56,931.42/78,564.96 = 31,439.37/x
3. Step 3: Cross multiply
   56,931.42x = 78,564.96 × 31,439.37
4. Step 4: Simplify right side
   56,931.42x = 2,470,032,846.48
5. Step 5: Solve for x
   x = 2,470,032,846.48/56,931.42
6. Step 6: Final answer
   x = 43,386.11