Finding the Fourth Proportional to 1,415.72, 1,953.84 and 818.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,415.72 : 1,953.84 = 818.36 : x
2. Step 2: Convert to fraction form
   1,415.72/1,953.84 = 818.36/x
3. Step 3: Cross multiply
   1,415.72x = 1,953.84 × 818.36
4. Step 4: Simplify right side
   1,415.72x = 1,598,944.50
5. Step 5: Solve for x
   x = 1,598,944.50/1,415.72
6. Step 6: Final answer
   x = 1,129.42