Finding the Fourth Proportional to 123,665.31, 170,818.30 and 91,465.38

Step by Step Solution

1. Step 1: Write the proportion equation
   123,665.31 : 170,818.30 = 91,465.38 : x
2. Step 2: Convert to fraction form
   123,665.31/170,818.30 = 91,465.38/x
3. Step 3: Cross multiply
   123,665.31x = 170,818.30 × 91,465.38
4. Step 4: Simplify right side
   123,665.31x = 15,623,960,491.79
5. Step 5: Solve for x
   x = 15,623,960,491.79/123,665.31
6. Step 6: Final answer
   x = 126,340.69