Finding the Fourth Proportional to 42,890.24, 64,333.30 and 11,725.56

Step by Step Solution

1. Step 1: Write the proportion equation
   42,890.24 : 64,333.30 = 11,725.56 : x
2. Step 2: Convert to fraction form
   42,890.24/64,333.30 = 11,725.56/x
3. Step 3: Cross multiply
   42,890.24x = 64,333.30 × 11,725.56
4. Step 4: Simplify right side
   42,890.24x = 754,343,969.15
5. Step 5: Solve for x
   x = 754,343,969.15/42,890.24
6. Step 6: Final answer
   x = 17,587.78