Finding the Fourth Proportional to 92,419.72, 138,615.12 and 30,089.80

Step by Step Solution

1. Step 1: Write the proportion equation
   92,419.72 : 138,615.12 = 30,089.80 : x
2. Step 2: Convert to fraction form
   92,419.72/138,615.12 = 30,089.80/x
3. Step 3: Cross multiply
   92,419.72x = 138,615.12 × 30,089.80
4. Step 4: Simplify right side
   92,419.72x = 4,170,901,237.78
5. Step 5: Solve for x
   x = 4,170,901,237.78/92,419.72
6. Step 6: Final answer
   x = 45,129.99