Finding the Fourth Proportional to 1,742.16, 2,612.72 and 919.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,742.16 : 2,612.72 = 919.98 : x
2. Step 2: Convert to fraction form
   1,742.16/2,612.72 = 919.98/x
3. Step 3: Cross multiply
   1,742.16x = 2,612.72 × 919.98
4. Step 4: Simplify right side
   1,742.16x = 2,403,650.15
5. Step 5: Solve for x
   x = 2,403,650.15/1,742.16
6. Step 6: Final answer
   x = 1,379.70