Finding the Fourth Proportional to 1,077,146.72, 1,615,223.40 and 318,716.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,077,146.72 : 1,615,223.40 = 318,716.96 : x
2. Step 2: Convert to fraction form
   1,077,146.72/1,615,223.40 = 318,716.96/x
3. Step 3: Cross multiply
   1,077,146.72x = 1,615,223.40 × 318,716.96
4. Step 4: Simplify right side
   1,077,146.72x = 514,799,091,768.86
5. Step 5: Solve for x
   x = 514,799,091,768.86/1,077,146.72
6. Step 6: Final answer
   x = 477,928.48