Finding the Fourth Proportional to 42,858.61, 64,298.10 and 17,884.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,858.61 : 64,298.10 = 17,884.78 : x
2. Step 2: Convert to fraction form
   42,858.61/64,298.10 = 17,884.78/x
3. Step 3: Cross multiply
   42,858.61x = 64,298.10 × 17,884.78
4. Step 4: Simplify right side
   42,858.61x = 1,149,957,051.43
5. Step 5: Solve for x
   x = 1,149,957,051.43/42,858.61
6. Step 6: Final answer
   x = 26,831.42