Finding the Fourth Proportional to 13,123.68, 19,667.89 and 7,191.64

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.68 : 19,667.89 = 7,191.64 : x
2. Step 2: Convert to fraction form
   13,123.68/19,667.89 = 7,191.64/x
3. Step 3: Cross multiply
   13,123.68x = 19,667.89 × 7,191.64
4. Step 4: Simplify right side
   13,123.68x = 141,444,384.44
5. Step 5: Solve for x
   x = 141,444,384.44/13,123.68
6. Step 6: Final answer
   x = 10,777.80