Finding the Fourth Proportional to 85,807.72, 128,717.34 and 23,478.76

Step by Step Solution

1. Step 1: Write the proportion equation
   85,807.72 : 128,717.34 = 23,478.76 : x
2. Step 2: Convert to fraction form
   85,807.72/128,717.34 = 23,478.76/x
3. Step 3: Cross multiply
   85,807.72x = 128,717.34 × 23,478.76
4. Step 4: Simplify right side
   85,807.72x = 3,022,123,533.70
5. Step 5: Solve for x
   x = 3,022,123,533.70/85,807.72
6. Step 6: Final answer
   x = 35,219.72