Finding the Fourth Proportional to 42,128.69, 63,199.52 and 15,835.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42,128.69 : 63,199.52 = 15,835.28 : x
2. Step 2: Convert to fraction form
   42,128.69/63,199.52 = 15,835.28/x
3. Step 3: Cross multiply
   42,128.69x = 63,199.52 × 15,835.28
4. Step 4: Simplify right side
   42,128.69x = 1,000,782,015.89
5. Step 5: Solve for x
   x = 1,000,782,015.89/42,128.69
6. Step 6: Final answer
   x = 23,755.36