Finding the Fourth Proportional to 7,155.96, 9,876.18 and 4,172.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,155.96 : 9,876.18 = 4,172.72 : x
2. Step 2: Convert to fraction form
   7,155.96/9,876.18 = 4,172.72/x
3. Step 3: Cross multiply
   7,155.96x = 9,876.18 × 4,172.72
4. Step 4: Simplify right side
   7,155.96x = 41,210,533.81
5. Step 5: Solve for x
   x = 41,210,533.81/7,155.96
6. Step 6: Final answer
   x = 5,758.91