Finding the Fourth Proportional to 389,837.90, 537,980.79 and 228,695.69

Step by Step Solution

1. Step 1: Write the proportion equation
   389,837.90 : 537,980.79 = 228,695.69 : x
2. Step 2: Convert to fraction form
   389,837.90/537,980.79 = 228,695.69/x
3. Step 3: Cross multiply
   389,837.90x = 537,980.79 × 228,695.69
4. Step 4: Simplify right side
   389,837.90x = 123,033,885,285.89
5. Step 5: Solve for x
   x = 123,033,885,285.89/389,837.90
6. Step 6: Final answer
   x = 315,602.68