Finding the Fourth Proportional to 155,857.71, 215,079.33 and 87,874.09

Step by Step Solution

1. Step 1: Write the proportion equation
   155,857.71 : 215,079.33 = 87,874.09 : x
2. Step 2: Convert to fraction form
   155,857.71/215,079.33 = 87,874.09/x
3. Step 3: Cross multiply
   155,857.71x = 215,079.33 × 87,874.09
4. Step 4: Simplify right side
   155,857.71x = 18,899,900,401.56
5. Step 5: Solve for x
   x = 18,899,900,401.56/155,857.71
6. Step 6: Final answer
   x = 121,263.81