Finding the Fourth Proportional to 71,791.39, 99,045.54 and 71,680.67

Step by Step Solution

1. Step 1: Write the proportion equation
   71,791.39 : 99,045.54 = 71,680.67 : x
2. Step 2: Convert to fraction form
   71,791.39/99,045.54 = 71,680.67/x
3. Step 3: Cross multiply
   71,791.39x = 99,045.54 × 71,680.67
4. Step 4: Simplify right side
   71,791.39x = 7,099,650,667.71
5. Step 5: Solve for x
   x = 7,099,650,667.71/71,791.39
6. Step 6: Final answer
   x = 98,892.79