Finding the Fourth Proportional to 13,278.64, 19,918.86 and 4,958.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,278.64 : 19,918.86 = 4,958.50 : x
2. Step 2: Convert to fraction form
   13,278.64/19,918.86 = 4,958.50/x
3. Step 3: Cross multiply
   13,278.64x = 19,918.86 × 4,958.50
4. Step 4: Simplify right side
   13,278.64x = 98,767,667.31
5. Step 5: Solve for x
   x = 98,767,667.31/13,278.64
6. Step 6: Final answer
   x = 7,438.09