Finding the Fourth Proportional to 978.10, 1,466.52 and 612.34

Step by Step Solution

1. Step 1: Write the proportion equation
   978.10 : 1,466.52 = 612.34 : x
2. Step 2: Convert to fraction form
   978.10/1,466.52 = 612.34/x
3. Step 3: Cross multiply
   978.10x = 1,466.52 × 612.34
4. Step 4: Simplify right side
   978.10x = 898,008.86
5. Step 5: Solve for x
   x = 898,008.86/978.10
6. Step 6: Final answer
   x = 918.12