Finding the Fourth Proportional to 155,931.71, 215,184.72 and 87,949.25

Step by Step Solution

1. Step 1: Write the proportion equation
   155,931.71 : 215,184.72 = 87,949.25 : x
2. Step 2: Convert to fraction form
   155,931.71/215,184.72 = 87,949.25/x
3. Step 3: Cross multiply
   155,931.71x = 215,184.72 × 87,949.25
4. Step 4: Simplify right side
   155,931.71x = 18,925,333,219.79
5. Step 5: Solve for x
   x = 18,925,333,219.79/155,931.71
6. Step 6: Final answer
   x = 121,369.37