Finding the Fourth Proportional to 1,415.87, 1,953.83 and 786.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,415.87 : 1,953.83 = 786.43 : x
2. Step 2: Convert to fraction form
   1,415.87/1,953.83 = 786.43/x
3. Step 3: Cross multiply
   1,415.87x = 1,953.83 × 786.43
4. Step 4: Simplify right side
   1,415.87x = 1,536,549.04
5. Step 5: Solve for x
   x = 1,536,549.04/1,415.87
6. Step 6: Final answer
   x = 1,085.24