Finding the Fourth Proportional to 155,854.45, 215,074.85 and 87,870.83

Step by Step Solution

1. Step 1: Write the proportion equation
   155,854.45 : 215,074.85 = 87,870.83 : x
2. Step 2: Convert to fraction form
   155,854.45/215,074.85 = 87,870.83/x
3. Step 3: Cross multiply
   155,854.45x = 215,074.85 × 87,870.83
4. Step 4: Simplify right side
   155,854.45x = 18,898,805,881.59
5. Step 5: Solve for x
   x = 18,898,805,881.59/155,854.45
6. Step 6: Final answer
   x = 121,259.32