Finding the Fourth Proportional to 1,985.28, 2,978.24 and 1,010.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,985.28 : 2,978.24 = 1,010.86 : x
2. Step 2: Convert to fraction form
   1,985.28/2,978.24 = 1,010.86/x
3. Step 3: Cross multiply
   1,985.28x = 2,978.24 × 1,010.86
4. Step 4: Simplify right side
   1,985.28x = 3,010,583.69
5. Step 5: Solve for x
   x = 3,010,583.69/1,985.28
6. Step 6: Final answer
   x = 1,516.45