Finding the Fourth Proportional to 1,111.48, 1,667.52 and 990.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.48 : 1,667.52 = 990.58 : x
2. Step 2: Convert to fraction form
   1,111.48/1,667.52 = 990.58/x
3. Step 3: Cross multiply
   1,111.48x = 1,667.52 × 990.58
4. Step 4: Simplify right side
   1,111.48x = 1,651,811.96
5. Step 5: Solve for x
   x = 1,651,811.96/1,111.48
6. Step 6: Final answer
   x = 1,486.14