Finding the Fourth Proportional to 1,291,535.72, 1,937,598.42 and 393,104.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,291,535.72 : 1,937,598.42 = 393,104.78 : x
2. Step 2: Convert to fraction form
   1,291,535.72/1,937,598.42 = 393,104.78/x
3. Step 3: Cross multiply
   1,291,535.72x = 1,937,598.42 × 393,104.78
4. Step 4: Simplify right side
   1,291,535.72x = 761,679,200,622.45
5. Step 5: Solve for x
   x = 761,679,200,622.45/1,291,535.72
6. Step 6: Final answer
   x = 589,746.91