Finding the Fourth Proportional to 91,308.20, 136,960.38 and 42,060.20

Step by Step Solution

1. Step 1: Write the proportion equation
   91,308.20 : 136,960.38 = 42,060.20 : x
2. Step 2: Convert to fraction form
   91,308.20/136,960.38 = 42,060.20/x
3. Step 3: Cross multiply
   91,308.20x = 136,960.38 × 42,060.20
4. Step 4: Simplify right side
   91,308.20x = 5,760,580,974.88
5. Step 5: Solve for x
   x = 5,760,580,974.88/91,308.20
6. Step 6: Final answer
   x = 63,089.42