Finding the Fourth Proportional to 42,858.86, 64,298.48 and 17,885.03

Step by Step Solution

1. Step 1: Write the proportion equation
   42,858.86 : 64,298.48 = 17,885.03 : x
2. Step 2: Convert to fraction form
   42,858.86/64,298.48 = 17,885.03/x
3. Step 3: Cross multiply
   42,858.86x = 64,298.48 × 17,885.03
4. Step 4: Simplify right side
   42,858.86x = 1,149,980,243.75
5. Step 5: Solve for x
   x = 1,149,980,243.75/42,858.86
6. Step 6: Final answer
   x = 26,831.80