Finding the Fourth Proportional to 151,407.76, 208,942.72 and 87,782.48

Step by Step Solution

1. Step 1: Write the proportion equation
   151,407.76 : 208,942.72 = 87,782.48 : x
2. Step 2: Convert to fraction form
   151,407.76/208,942.72 = 87,782.48/x
3. Step 3: Cross multiply
   151,407.76x = 208,942.72 × 87,782.48
4. Step 4: Simplify right side
   151,407.76x = 18,341,510,139.55
5. Step 5: Solve for x
   x = 18,341,510,139.55/151,407.76
6. Step 6: Final answer
   x = 121,139.83