Finding the Fourth Proportional to 61,085.98, 91,643.31 and 18,963.91

Step by Step Solution

1. Step 1: Write the proportion equation
   61,085.98 : 91,643.31 = 18,963.91 : x
2. Step 2: Convert to fraction form
   61,085.98/91,643.31 = 18,963.91/x
3. Step 3: Cross multiply
   61,085.98x = 91,643.31 × 18,963.91
4. Step 4: Simplify right side
   61,085.98x = 1,737,915,024.73
5. Step 5: Solve for x
   x = 1,737,915,024.73/61,085.98
6. Step 6: Final answer
   x = 28,450.31