Finding the Fourth Proportional to 71,769.77, 99,072.97 and 51,086.74

Step by Step Solution

1. Step 1: Write the proportion equation
   71,769.77 : 99,072.97 = 51,086.74 : x
2. Step 2: Convert to fraction form
   71,769.77/99,072.97 = 51,086.74/x
3. Step 3: Cross multiply
   71,769.77x = 99,072.97 × 51,086.74
4. Step 4: Simplify right side
   71,769.77x = 5,061,314,684.02
5. Step 5: Solve for x
   x = 5,061,314,684.02/71,769.77
6. Step 6: Final answer
   x = 70,521.54