Finding the Fourth Proportional to 87,567.78, 120,801.59 and 84,172.80

Step by Step Solution

1. Step 1: Write the proportion equation
   87,567.78 : 120,801.59 = 84,172.80 : x
2. Step 2: Convert to fraction form
   87,567.78/120,801.59 = 84,172.80/x
3. Step 3: Cross multiply
   87,567.78x = 120,801.59 × 84,172.80
4. Step 4: Simplify right side
   87,567.78x = 10,168,208,896.01
5. Step 5: Solve for x
   x = 10,168,208,896.01/87,567.78
6. Step 6: Final answer
   x = 116,118.15