Finding the Fourth Proportional to 90,211.05, 135,227.34 and 42,742.76

Step by Step Solution

1. Step 1: Write the proportion equation
   90,211.05 : 135,227.34 = 42,742.76 : x
2. Step 2: Convert to fraction form
   90,211.05/135,227.34 = 42,742.76/x
3. Step 3: Cross multiply
   90,211.05x = 135,227.34 × 42,742.76
4. Step 4: Simplify right side
   90,211.05x = 5,779,989,062.92
5. Step 5: Solve for x
   x = 5,779,989,062.92/90,211.05
6. Step 6: Final answer
   x = 64,071.85