Finding the Fourth Proportional to 2,415,688.86, 3,621,280.68 and 817,139.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,415,688.86 : 3,621,280.68 = 817,139.55 : x
2. Step 2: Convert to fraction form
   2,415,688.86/3,621,280.68 = 817,139.55/x
3. Step 3: Cross multiply
   2,415,688.86x = 3,621,280.68 × 817,139.55
4. Step 4: Simplify right side
   2,415,688.86x = 2,959,091,665,278.89
5. Step 5: Solve for x
   x = 2,959,091,665,278.89/2,415,688.86
6. Step 6: Final answer
   x = 1,224,947.35