Finding the Fourth Proportional to 2,385.47, 3,574.31 and 1,213.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,385.47 : 3,574.31 = 1,213.86 : x
2. Step 2: Convert to fraction form
   2,385.47/3,574.31 = 1,213.86/x
3. Step 3: Cross multiply
   2,385.47x = 3,574.31 × 1,213.86
4. Step 4: Simplify right side
   2,385.47x = 4,338,694.74
5. Step 5: Solve for x
   x = 4,338,694.74/2,385.47
6. Step 6: Final answer
   x = 1,818.80