Finding the Fourth Proportional to 66,378.42, 91,531.89 and 42,506.10

Step by Step Solution

1. Step 1: Write the proportion equation
   66,378.42 : 91,531.89 = 42,506.10 : x
2. Step 2: Convert to fraction form
   66,378.42/91,531.89 = 42,506.10/x
3. Step 3: Cross multiply
   66,378.42x = 91,531.89 × 42,506.10
4. Step 4: Simplify right side
   66,378.42x = 3,890,663,669.53
5. Step 5: Solve for x
   x = 3,890,663,669.53/66,378.42
6. Step 6: Final answer
   x = 58,613.38