Finding the Fourth Proportional to 42,471.60, 63,728.16 and 30,071.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42,471.60 : 63,728.16 = 30,071.31 : x
2. Step 2: Convert to fraction form
   42,471.60/63,728.16 = 30,071.31/x
3. Step 3: Cross multiply
   42,471.60x = 63,728.16 × 30,071.31
4. Step 4: Simplify right side
   42,471.60x = 1,916,389,255.09
5. Step 5: Solve for x
   x = 1,916,389,255.09/42,471.60
6. Step 6: Final answer
   x = 45,121.66