Finding the Fourth Proportional to 103,717.42, 142,828.88 and 90,099.27

Step by Step Solution

1. Step 1: Write the proportion equation
   103,717.42 : 142,828.88 = 90,099.27 : x
2. Step 2: Convert to fraction form
   103,717.42/142,828.88 = 90,099.27/x
3. Step 3: Cross multiply
   103,717.42x = 142,828.88 × 90,099.27
4. Step 4: Simplify right side
   103,717.42x = 12,868,777,372.42
5. Step 5: Solve for x
   x = 12,868,777,372.42/103,717.42
6. Step 6: Final answer
   x = 124,075.37