Finding the Fourth Proportional to 1,415.98, 1,953.99 and 786.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,415.98 : 1,953.99 = 786.55 : x
2. Step 2: Convert to fraction form
   1,415.98/1,953.99 = 786.55/x
3. Step 3: Cross multiply
   1,415.98x = 1,953.99 × 786.55
4. Step 4: Simplify right side
   1,415.98x = 1,536,910.83
5. Step 5: Solve for x
   x = 1,536,910.83/1,415.98
6. Step 6: Final answer
   x = 1,085.40