Finding the Fourth Proportional to 83.90, 124.76 and 83.00

Step by Step Solution

1. Step 1: Write the proportion equation
   83.90 : 124.76 = 83.00 : x
2. Step 2: Convert to fraction form
   83.90/124.76 = 83.00/x
3. Step 3: Cross multiply
   83.90x = 124.76 × 83.00
4. Step 4: Simplify right side
   83.90x = 10,354.35
5. Step 5: Solve for x
   x = 10,354.35/83.90
6. Step 6: Final answer
   x = 123.42