Finding the Fourth Proportional to 42,856.61, 64,295.10 and 17,882.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,856.61 : 64,295.10 = 17,882.78 : x
2. Step 2: Convert to fraction form
   42,856.61/64,295.10 = 17,882.78/x
3. Step 3: Cross multiply
   42,856.61x = 64,295.10 × 17,882.78
4. Step 4: Simplify right side
   42,856.61x = 1,149,774,806.90
5. Step 5: Solve for x
   x = 1,149,774,806.90/42,856.61
6. Step 6: Final answer
   x = 26,828.42