Finding the Fourth Proportional to 61,289.34, 91,878.53 and 42,578.15

Step by Step Solution

1. Step 1: Write the proportion equation
   61,289.34 : 91,878.53 = 42,578.15 : x
2. Step 2: Convert to fraction form
   61,289.34/91,878.53 = 42,578.15/x
3. Step 3: Cross multiply
   61,289.34x = 91,878.53 × 42,578.15
4. Step 4: Simplify right side
   61,289.34x = 3,912,017,159.84
5. Step 5: Solve for x
   x = 3,912,017,159.84/61,289.34
6. Step 6: Final answer
   x = 63,828.67