Finding the Fourth Proportional to 938,406.18, 1,407,312 and 339,288.06

Step by Step Solution

1. Step 1: Write the proportion equation
   938,406.18 : 1,407,312 = 339,288.06 : x
2. Step 2: Convert to fraction form
   938,406.18/1,407,312 = 339,288.06/x
3. Step 3: Cross multiply
   938,406.18x = 1,407,312 × 339,288.06
4. Step 4: Simplify right side
   938,406.18x = 477,484,158,294.72
5. Step 5: Solve for x
   x = 477,484,158,294.72/938,406.18
6. Step 6: Final answer
   x = 508,824.61