Finding the Fourth Proportional to 1,372.69, 1,893.66 and 999.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,372.69 : 1,893.66 = 999.50 : x
2. Step 2: Convert to fraction form
   1,372.69/1,893.66 = 999.50/x
3. Step 3: Cross multiply
   1,372.69x = 1,893.66 × 999.50
4. Step 4: Simplify right side
   1,372.69x = 1,892,713.17
5. Step 5: Solve for x
   x = 1,892,713.17/1,372.69
6. Step 6: Final answer
   x = 1,378.84