Finding the Fourth Proportional to 143,820.61, 198,343.54 and 90,111.53

Step by Step Solution

1. Step 1: Write the proportion equation
   143,820.61 : 198,343.54 = 90,111.53 : x
2. Step 2: Convert to fraction form
   143,820.61/198,343.54 = 90,111.53/x
3. Step 3: Cross multiply
   143,820.61x = 198,343.54 × 90,111.53
4. Step 4: Simplify right side
   143,820.61x = 17,873,039,855.02
5. Step 5: Solve for x
   x = 17,873,039,855.02/143,820.61
6. Step 6: Final answer
   x = 124,273.15