Finding the Fourth Proportional to 13,089.70, 19,486.50 and 13,011.86

Step by Step Solution

1. Step 1: Write the proportion equation
   13,089.70 : 19,486.50 = 13,011.86 : x
2. Step 2: Convert to fraction form
   13,089.70/19,486.50 = 13,011.86/x
3. Step 3: Cross multiply
   13,089.70x = 19,486.50 × 13,011.86
4. Step 4: Simplify right side
   13,089.70x = 253,555,509.39
5. Step 5: Solve for x
   x = 253,555,509.39/13,089.70
6. Step 6: Final answer
   x = 19,370.61