Finding the Fourth Proportional to 42,978.04, 64,470.18 and 17,992.96

Step by Step Solution

1. Step 1: Write the proportion equation
   42,978.04 : 64,470.18 = 17,992.96 : x
2. Step 2: Convert to fraction form
   42,978.04/64,470.18 = 17,992.96/x
3. Step 3: Cross multiply
   42,978.04x = 64,470.18 × 17,992.96
4. Step 4: Simplify right side
   42,978.04x = 1,160,009,369.93
5. Step 5: Solve for x
   x = 1,160,009,369.93/42,978.04
6. Step 6: Final answer
   x = 26,990.75