Finding the Fourth Proportional to 80,109.72, 110,554.32 and 51,815.40

Step by Step Solution

1. Step 1: Write the proportion equation
   80,109.72 : 110,554.32 = 51,815.40 : x
2. Step 2: Convert to fraction form
   80,109.72/110,554.32 = 51,815.40/x
3. Step 3: Cross multiply
   80,109.72x = 110,554.32 × 51,815.40
4. Step 4: Simplify right side
   80,109.72x = 5,728,416,312.53
5. Step 5: Solve for x
   x = 5,728,416,312.53/80,109.72
6. Step 6: Final answer
   x = 71,507.13