Finding the Fourth Proportional to 1,085.95, 1,624.74 and 913.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.95 : 1,624.74 = 913.15 : x
2. Step 2: Convert to fraction form
   1,085.95/1,624.74 = 913.15/x
3. Step 3: Cross multiply
   1,085.95x = 1,624.74 × 913.15
4. Step 4: Simplify right side
   1,085.95x = 1,483,631.33
5. Step 5: Solve for x
   x = 1,483,631.33/1,085.95
6. Step 6: Final answer
   x = 1,366.21