Finding the Fourth Proportional to 42,991.52, 64,491.12 and 11,826.88

Step by Step Solution

1. Step 1: Write the proportion equation
   42,991.52 : 64,491.12 = 11,826.88 : x
2. Step 2: Convert to fraction form
   42,991.52/64,491.12 = 11,826.88/x
3. Step 3: Cross multiply
   42,991.52x = 64,491.12 × 11,826.88
4. Step 4: Simplify right side
   42,991.52x = 762,728,737.31
5. Step 5: Solve for x
   x = 762,728,737.31/42,991.52
6. Step 6: Final answer
   x = 17,741.38