Finding the Fourth Proportional to 42,485.76, 63,717.12 and 17,856

Step by Step Solution

1. Step 1: Write the proportion equation
   42,485.76 : 63,717.12 = 17,856 : x
2. Step 2: Convert to fraction form
   42,485.76/63,717.12 = 17,856/x
3. Step 3: Cross multiply
   42,485.76x = 63,717.12 × 17,856
4. Step 4: Simplify right side
   42,485.76x = 1,137,732,894.72
5. Step 5: Solve for x
   x = 1,137,732,894.72/42,485.76
6. Step 6: Final answer
   x = 26,779.16