Finding the Fourth Proportional to 978.90, 1,460.10 and 910.86

Step by Step Solution

1. Step 1: Write the proportion equation
   978.90 : 1,460.10 = 910.86 : x
2. Step 2: Convert to fraction form
   978.90/1,460.10 = 910.86/x
3. Step 3: Cross multiply
   978.90x = 1,460.10 × 910.86
4. Step 4: Simplify right side
   978.90x = 1,329,946.69
5. Step 5: Solve for x
   x = 1,329,946.69/978.90
6. Step 6: Final answer
   x = 1,358.61