Finding the Fourth Proportional to 315,353.04, 472,978.42 and 90,662.28

Step by Step Solution

1. Step 1: Write the proportion equation
   315,353.04 : 472,978.42 = 90,662.28 : x
2. Step 2: Convert to fraction form
   315,353.04/472,978.42 = 90,662.28/x
3. Step 3: Cross multiply
   315,353.04x = 472,978.42 × 90,662.28
4. Step 4: Simplify right side
   315,353.04x = 42,881,301,948.00
5. Step 5: Solve for x
   x = 42,881,301,948.00/315,353.04
6. Step 6: Final answer
   x = 135,978.72