Finding the Fourth Proportional to 2,880,576.81, 4,321,085.72 and 858,666.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,880,576.81 : 4,321,085.72 = 858,666.15 : x
2. Step 2: Convert to fraction form
   2,880,576.81/4,321,085.72 = 858,666.15/x
3. Step 3: Cross multiply
   2,880,576.81x = 4,321,085.72 × 858,666.15
4. Step 4: Simplify right side
   2,880,576.81x = 3,710,370,034,719.05
5. Step 5: Solve for x
   x = 3,710,370,034,719.05/2,880,576.81
6. Step 6: Final answer
   x = 1,288,064.95