Finding the Fourth Proportional to 85,401.72, 117,889.11 and 55,189.53

Step by Step Solution

1. Step 1: Write the proportion equation
   85,401.72 : 117,889.11 = 55,189.53 : x
2. Step 2: Convert to fraction form
   85,401.72/117,889.11 = 55,189.53/x
3. Step 3: Cross multiply
   85,401.72x = 117,889.11 × 55,189.53
4. Step 4: Simplify right side
   85,401.72x = 6,506,243,707.63
5. Step 5: Solve for x
   x = 6,506,243,707.63/85,401.72
6. Step 6: Final answer
   x = 76,183.99