Finding the Fourth Proportional to 42,128.91, 63,228.60 and 19,957.59

Step by Step Solution

1. Step 1: Write the proportion equation
   42,128.91 : 63,228.60 = 19,957.59 : x
2. Step 2: Convert to fraction form
   42,128.91/63,228.60 = 19,957.59/x
3. Step 3: Cross multiply
   42,128.91x = 63,228.60 × 19,957.59
4. Step 4: Simplify right side
   42,128.91x = 1,261,890,475.07
5. Step 5: Solve for x
   x = 1,261,890,475.07/42,128.91
6. Step 6: Final answer
   x = 29,953.08