Finding the Fourth Proportional to 919,111.30, 1,378,710.15 and 288,045.70

Step by Step Solution

1. Step 1: Write the proportion equation
   919,111.30 : 1,378,710.15 = 288,045.70 : x
2. Step 2: Convert to fraction form
   919,111.30/1,378,710.15 = 288,045.70/x
3. Step 3: Cross multiply
   919,111.30x = 1,378,710.15 × 288,045.70
4. Step 4: Simplify right side
   919,111.30x = 397,131,530,253.86
5. Step 5: Solve for x
   x = 397,131,530,253.86/919,111.30
6. Step 6: Final answer
   x = 432,082.09