Finding the Fourth Proportional to 42,959.56, 64,417.38 and 17,992.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,959.56 : 64,417.38 = 17,992.78 : x
2. Step 2: Convert to fraction form
   42,959.56/64,417.38 = 17,992.78/x
3. Step 3: Cross multiply
   42,959.56x = 64,417.38 × 17,992.78
4. Step 4: Simplify right side
   42,959.56x = 1,159,047,746.52
5. Step 5: Solve for x
   x = 1,159,047,746.52/42,959.56
6. Step 6: Final answer
   x = 26,979.97