Finding the Fourth Proportional to 921,059.91, 1,380,922.83 and 388,288.49

Step by Step Solution

1. Step 1: Write the proportion equation
   921,059.91 : 1,380,922.83 = 388,288.49 : x
2. Step 2: Convert to fraction form
   921,059.91/1,380,922.83 = 388,288.49/x
3. Step 3: Cross multiply
   921,059.91x = 1,380,922.83 × 388,288.49
4. Step 4: Simplify right side
   921,059.91x = 536,196,433,562.61
5. Step 5: Solve for x
   x = 536,196,433,562.61/921,059.91
6. Step 6: Final answer
   x = 582,151.53