Finding the Fourth Proportional to 1,300.57, 1,951.35 and 780.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,300.57 : 1,951.35 = 780.93 : x
2. Step 2: Convert to fraction form
   1,300.57/1,951.35 = 780.93/x
3. Step 3: Cross multiply
   1,300.57x = 1,951.35 × 780.93
4. Step 4: Simplify right side
   1,300.57x = 1,523,873.61
5. Step 5: Solve for x
   x = 1,523,873.61/1,300.57
6. Step 6: Final answer
   x = 1,171.70