Finding the Fourth Proportional to 66,631.48, 91,942.59 and 42,790.45

Step by Step Solution

1. Step 1: Write the proportion equation
   66,631.48 : 91,942.59 = 42,790.45 : x
2. Step 2: Convert to fraction form
   66,631.48/91,942.59 = 42,790.45/x
3. Step 3: Cross multiply
   66,631.48x = 91,942.59 × 42,790.45
4. Step 4: Simplify right side
   66,631.48x = 3,934,264,800.27
5. Step 5: Solve for x
   x = 3,934,264,800.27/66,631.48
6. Step 6: Final answer
   x = 59,045.14