Finding the Fourth Proportional to 65,997.96, 91,069.02 and 42,138.60

Step by Step Solution

1. Step 1: Write the proportion equation
   65,997.96 : 91,069.02 = 42,138.60 : x
2. Step 2: Convert to fraction form
   65,997.96/91,069.02 = 42,138.60/x
3. Step 3: Cross multiply
   65,997.96x = 91,069.02 × 42,138.60
4. Step 4: Simplify right side
   65,997.96x = 3,837,521,006.17
5. Step 5: Solve for x
   x = 3,837,521,006.17/65,997.96
6. Step 6: Final answer
   x = 58,146.05