Finding the Fourth Proportional to 1,320.72, 1,977.93 and 792.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.72 : 1,977.93 = 792.15 : x
2. Step 2: Convert to fraction form
   1,320.72/1,977.93 = 792.15/x
3. Step 3: Cross multiply
   1,320.72x = 1,977.93 × 792.15
4. Step 4: Simplify right side
   1,320.72x = 1,566,817.25
5. Step 5: Solve for x
   x = 1,566,817.25/1,320.72
6. Step 6: Final answer
   x = 1,186.34