Finding the Fourth Proportional to 1,038,061.49, 1,557,317.91 and 318,406.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,038,061.49 : 1,557,317.91 = 318,406.05 : x
2. Step 2: Convert to fraction form
   1,038,061.49/1,557,317.91 = 318,406.05/x
3. Step 3: Cross multiply
   1,038,061.49x = 1,557,317.91 × 318,406.05
4. Step 4: Simplify right side
   1,038,061.49x = 495,859,444,317.36
5. Step 5: Solve for x
   x = 495,859,444,317.36/1,038,061.49
6. Step 6: Final answer
   x = 477,678.30