Finding the Fourth Proportional to 257,935.16, 386,905.58 and 78,022.42

Step by Step Solution

1. Step 1: Write the proportion equation
   257,935.16 : 386,905.58 = 78,022.42 : x
2. Step 2: Convert to fraction form
   257,935.16/386,905.58 = 78,022.42/x
3. Step 3: Cross multiply
   257,935.16x = 386,905.58 × 78,022.42
4. Step 4: Simplify right side
   257,935.16x = 30,187,309,663.10
5. Step 5: Solve for x
   x = 30,187,309,663.10/257,935.16
6. Step 6: Final answer
   x = 117,034.49