Finding the Fourth Proportional to 918,566.32, 1,377,105.96 and 287,155.12

Step by Step Solution

1. Step 1: Write the proportion equation
   918,566.32 : 1,377,105.96 = 287,155.12 : x
2. Step 2: Convert to fraction form
   918,566.32/1,377,105.96 = 287,155.12/x
3. Step 3: Cross multiply
   918,566.32x = 1,377,105.96 × 287,155.12
4. Step 4: Simplify right side
   918,566.32x = 395,443,027,196.52
5. Step 5: Solve for x
   x = 395,443,027,196.52/918,566.32
6. Step 6: Final answer
   x = 430,500.25