Finding the Fourth Proportional to 155,931.71, 215,185.46 and 87,948.47

Step by Step Solution

1. Step 1: Write the proportion equation
   155,931.71 : 215,185.46 = 87,948.47 : x
2. Step 2: Convert to fraction form
   155,931.71/215,185.46 = 87,948.47/x
3. Step 3: Cross multiply
   155,931.71x = 215,185.46 × 87,948.47
4. Step 4: Simplify right side
   155,931.71x = 18,925,231,973.25
5. Step 5: Solve for x
   x = 18,925,231,973.25/155,931.71
6. Step 6: Final answer
   x = 121,368.72