Finding the Fourth Proportional to 155,859.16, 215,081.33 and 87,875.54

Step by Step Solution

1. Step 1: Write the proportion equation
   155,859.16 : 215,081.33 = 87,875.54 : x
2. Step 2: Convert to fraction form
   155,859.16/215,081.33 = 87,875.54/x
3. Step 3: Cross multiply
   155,859.16x = 215,081.33 × 87,875.54
4. Step 4: Simplify right side
   155,859.16x = 18,900,388,017.67
5. Step 5: Solve for x
   x = 18,900,388,017.67/155,859.16
6. Step 6: Final answer
   x = 121,265.81