Finding the Fourth Proportional to 19,419.60, 26,780.56 and 12,703.12

Step by Step Solution

1. Step 1: Write the proportion equation
   19,419.60 : 26,780.56 = 12,703.12 : x
2. Step 2: Convert to fraction form
   19,419.60/26,780.56 = 12,703.12/x
3. Step 3: Cross multiply
   19,419.60x = 26,780.56 × 12,703.12
4. Step 4: Simplify right side
   19,419.60x = 340,196,667.35
5. Step 5: Solve for x
   x = 340,196,667.35/19,419.60
6. Step 6: Final answer
   x = 17,518.21