Finding the Fourth Proportional to 82,138.80, 113,302.62 and 51,870.72

Step by Step Solution

1. Step 1: Write the proportion equation
   82,138.80 : 113,302.62 = 51,870.72 : x
2. Step 2: Convert to fraction form
   82,138.80/113,302.62 = 51,870.72/x
3. Step 3: Cross multiply
   82,138.80x = 113,302.62 × 51,870.72
4. Step 4: Simplify right side
   82,138.80x = 5,877,088,477.29
5. Step 5: Solve for x
   x = 5,877,088,477.29/82,138.80
6. Step 6: Final answer
   x = 71,550.70