Finding the Fourth Proportional to 1,146,827.76, 1,720,397.16 and 398,776.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,146,827.76 : 1,720,397.16 = 398,776.56 : x
2. Step 2: Convert to fraction form
   1,146,827.76/1,720,397.16 = 398,776.56/x
3. Step 3: Cross multiply
   1,146,827.76x = 1,720,397.16 × 398,776.56
4. Step 4: Simplify right side
   1,146,827.76x = 686,054,061,298.57
5. Step 5: Solve for x
   x = 686,054,061,298.57/1,146,827.76
6. Step 6: Final answer
   x = 598,218.92