Finding the Fourth Proportional to 56,637.27, 78,157.40 and 31,143.42

Step by Step Solution

1. Step 1: Write the proportion equation
   56,637.27 : 78,157.40 = 31,143.42 : x
2. Step 2: Convert to fraction form
   56,637.27/78,157.40 = 31,143.42/x
3. Step 3: Cross multiply
   56,637.27x = 78,157.40 × 31,143.42
4. Step 4: Simplify right side
   56,637.27x = 2,434,088,578.59
5. Step 5: Solve for x
   x = 2,434,088,578.59/56,637.27
6. Step 6: Final answer
   x = 42,976.80