Finding the Fourth Proportional to 1,499.78, 2,069.48 and 836.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,499.78 : 2,069.48 = 836.58 : x
2. Step 2: Convert to fraction form
   1,499.78/2,069.48 = 836.58/x
3. Step 3: Cross multiply
   1,499.78x = 2,069.48 × 836.58
4. Step 4: Simplify right side
   1,499.78x = 1,731,285.58
5. Step 5: Solve for x
   x = 1,731,285.58/1,499.78
6. Step 6: Final answer
   x = 1,154.36