Finding the Fourth Proportional to 315,010.76, 472,471.89 and 90,390.33

Step by Step Solution

1. Step 1: Write the proportion equation
   315,010.76 : 472,471.89 = 90,390.33 : x
2. Step 2: Convert to fraction form
   315,010.76/472,471.89 = 90,390.33/x
3. Step 3: Cross multiply
   315,010.76x = 472,471.89 × 90,390.33
4. Step 4: Simplify right side
   315,010.76x = 42,706,889,713.86
5. Step 5: Solve for x
   x = 42,706,889,713.86/315,010.76
6. Step 6: Final answer
   x = 135,572.80