Finding the Fourth Proportional to 42,978.66, 64,173.86 and 38,507.46

Step by Step Solution

1. Step 1: Write the proportion equation
   42,978.66 : 64,173.86 = 38,507.46 : x
2. Step 2: Convert to fraction form
   42,978.66/64,173.86 = 38,507.46/x
3. Step 3: Cross multiply
   42,978.66x = 64,173.86 × 38,507.46
4. Step 4: Simplify right side
   42,978.66x = 2,471,172,154.46
5. Step 5: Solve for x
   x = 2,471,172,154.46/42,978.66
6. Step 6: Final answer
   x = 57,497.65