Finding the Fourth Proportional to 56,638.05, 78,160.80 and 31,146.06

Step by Step Solution

1. Step 1: Write the proportion equation
   56,638.05 : 78,160.80 = 31,146.06 : x
2. Step 2: Convert to fraction form
   56,638.05/78,160.80 = 31,146.06/x
3. Step 3: Cross multiply
   56,638.05x = 78,160.80 × 31,146.06
4. Step 4: Simplify right side
   56,638.05x = 2,434,400,966.45
5. Step 5: Solve for x
   x = 2,434,400,966.45/56,638.05
6. Step 6: Final answer
   x = 42,981.72