Finding the Fourth Proportional to 12,990.93, 19,484.78 and 5,199.81

Step by Step Solution

1. Step 1: Write the proportion equation
   12,990.93 : 19,484.78 = 5,199.81 : x
2. Step 2: Convert to fraction form
   12,990.93/19,484.78 = 5,199.81/x
3. Step 3: Cross multiply
   12,990.93x = 19,484.78 × 5,199.81
4. Step 4: Simplify right side
   12,990.93x = 101,317,127.89
5. Step 5: Solve for x
   x = 101,317,127.89/12,990.93
6. Step 6: Final answer
   x = 7,799.07