Finding the Fourth Proportional to 89,428.10, 134,401.35 and 78,023.30

Step by Step Solution

1. Step 1: Write the proportion equation
   89,428.10 : 134,401.35 = 78,023.30 : x
2. Step 2: Convert to fraction form
   89,428.10/134,401.35 = 78,023.30/x
3. Step 3: Cross multiply
   89,428.10x = 134,401.35 × 78,023.30
4. Step 4: Simplify right side
   89,428.10x = 10,486,436,851.46
5. Step 5: Solve for x
   x = 10,486,436,851.46/89,428.10
6. Step 6: Final answer
   x = 117,261.09