Finding the Fourth Proportional to 42,128.76, 63,156.12 and 17,189.81

Step by Step Solution

1. Step 1: Write the proportion equation
   42,128.76 : 63,156.12 = 17,189.81 : x
2. Step 2: Convert to fraction form
   42,128.76/63,156.12 = 17,189.81/x
3. Step 3: Cross multiply
   42,128.76x = 63,156.12 × 17,189.81
4. Step 4: Simplify right side
   42,128.76x = 1,085,641,703.14
5. Step 5: Solve for x
   x = 1,085,641,703.14/42,128.76
6. Step 6: Final answer
   x = 25,769.61