Finding the Fourth Proportional to 42,931.20, 64,389.51 and 11,341.61

Step by Step Solution

1. Step 1: Write the proportion equation
   42,931.20 : 64,389.51 = 11,341.61 : x
2. Step 2: Convert to fraction form
   42,931.20/64,389.51 = 11,341.61/x
3. Step 3: Cross multiply
   42,931.20x = 64,389.51 × 11,341.61
4. Step 4: Simplify right side
   42,931.20x = 730,280,710.51
5. Step 5: Solve for x
   x = 730,280,710.51/42,931.20
6. Step 6: Final answer
   x = 17,010.49