Finding the Fourth Proportional to 42,780.76, 64,162.50 and 11,616.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42,780.76 : 64,162.50 = 11,616.28 : x
2. Step 2: Convert to fraction form
   42,780.76/64,162.50 = 11,616.28/x
3. Step 3: Cross multiply
   42,780.76x = 64,162.50 × 11,616.28
4. Step 4: Simplify right side
   42,780.76x = 745,329,565.50
5. Step 5: Solve for x
   x = 745,329,565.50/42,780.76
6. Step 6: Final answer
   x = 17,422.07