Finding the Fourth Proportional to 65,309.74, 90,042.89 and 42,298.63

Step by Step Solution

1. Step 1: Write the proportion equation
   65,309.74 : 90,042.89 = 42,298.63 : x
2. Step 2: Convert to fraction form
   65,309.74/90,042.89 = 42,298.63/x
3. Step 3: Cross multiply
   65,309.74x = 90,042.89 × 42,298.63
4. Step 4: Simplify right side
   65,309.74x = 3,808,690,942.82
5. Step 5: Solve for x
   x = 3,808,690,942.82/65,309.74
6. Step 6: Final answer
   x = 58,317.35