Finding the Fourth Proportional to 42,890.94, 64,334.43 and 11,726.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,890.94 : 64,334.43 = 11,726.10 : x
2. Step 2: Convert to fraction form
   42,890.94/64,334.43 = 11,726.10/x
3. Step 3: Cross multiply
   42,890.94x = 64,334.43 × 11,726.10
4. Step 4: Simplify right side
   42,890.94x = 754,391,959.62
5. Step 5: Solve for x
   x = 754,391,959.62/42,890.94
6. Step 6: Final answer
   x = 17,588.61