Finding the Fourth Proportional to 42,128.02, 63,175.56 and 21,061.54

Step by Step Solution

1. Step 1: Write the proportion equation
   42,128.02 : 63,175.56 = 21,061.54 : x
2. Step 2: Convert to fraction form
   42,128.02/63,175.56 = 21,061.54/x
3. Step 3: Cross multiply
   42,128.02x = 63,175.56 × 21,061.54
4. Step 4: Simplify right side
   42,128.02x = 1,330,574,583.96
5. Step 5: Solve for x
   x = 1,330,574,583.96/42,128.02
6. Step 6: Final answer
   x = 31,584.08