Finding the Fourth Proportional to 947.88, 1,419.46 and 810.72

Step by Step Solution

1. Step 1: Write the proportion equation
   947.88 : 1,419.46 = 810.72 : x
2. Step 2: Convert to fraction form
   947.88/1,419.46 = 810.72/x
3. Step 3: Cross multiply
   947.88x = 1,419.46 × 810.72
4. Step 4: Simplify right side
   947.88x = 1,150,784.61
5. Step 5: Solve for x
   x = 1,150,784.61/947.88
6. Step 6: Final answer
   x = 1,214.06