Finding the Fourth Proportional to 1,300.59, 1,947.51 and 813.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,300.59 : 1,947.51 = 813.99 : x
2. Step 2: Convert to fraction form
   1,300.59/1,947.51 = 813.99/x
3. Step 3: Cross multiply
   1,300.59x = 1,947.51 × 813.99
4. Step 4: Simplify right side
   1,300.59x = 1,585,253.66
5. Step 5: Solve for x
   x = 1,585,253.66/1,300.59
6. Step 6: Final answer
   x = 1,218.87