Finding the Fourth Proportional to 1,145.61, 1,580.00 and 995.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.61 : 1,580.00 = 995.99 : x
2. Step 2: Convert to fraction form
   1,145.61/1,580.00 = 995.99/x
3. Step 3: Cross multiply
   1,145.61x = 1,580.00 × 995.99
4. Step 4: Simplify right side
   1,145.61x = 1,573,651.32
5. Step 5: Solve for x
   x = 1,573,651.32/1,145.61
6. Step 6: Final answer
   x = 1,373.64