Finding the Fourth Proportional to 12,688.93, 19,030.32 and 5,293.45

Step by Step Solution

1. Step 1: Write the proportion equation
   12,688.93 : 19,030.32 = 5,293.45 : x
2. Step 2: Convert to fraction form
   12,688.93/19,030.32 = 5,293.45/x
3. Step 3: Cross multiply
   12,688.93x = 19,030.32 × 5,293.45
4. Step 4: Simplify right side
   12,688.93x = 100,736,056.30
5. Step 5: Solve for x
   x = 100,736,056.30/12,688.93
6. Step 6: Final answer
   x = 7,938.89