Finding the Fourth Proportional to 4,748.07, 7,123.70 and 2,991.05

Step by Step Solution

1. Step 1: Write the proportion equation
   4,748.07 : 7,123.70 = 2,991.05 : x
2. Step 2: Convert to fraction form
   4,748.07/7,123.70 = 2,991.05/x
3. Step 3: Cross multiply
   4,748.07x = 7,123.70 × 2,991.05
4. Step 4: Simplify right side
   4,748.07x = 21,307,342.89
5. Step 5: Solve for x
   x = 21,307,342.89/4,748.07
6. Step 6: Final answer
   x = 4,487.58