Finding the Fourth Proportional to 42,978.16, 64,173.11 and 38,506.96

Step by Step Solution

1. Step 1: Write the proportion equation
   42,978.16 : 64,173.11 = 38,506.96 : x
2. Step 2: Convert to fraction form
   42,978.16/64,173.11 = 38,506.96/x
3. Step 3: Cross multiply
   42,978.16x = 64,173.11 × 38,506.96
4. Step 4: Simplify right side
   42,978.16x = 2,471,111,379.85
5. Step 5: Solve for x
   x = 2,471,111,379.85/42,978.16
6. Step 6: Final answer
   x = 57,496.91