Finding the Fourth Proportional to 12,985.10, 19,443.99 and 10,900.34

Step by Step Solution

1. Step 1: Write the proportion equation
   12,985.10 : 19,443.99 = 10,900.34 : x
2. Step 2: Convert to fraction form
   12,985.10/19,443.99 = 10,900.34/x
3. Step 3: Cross multiply
   12,985.10x = 19,443.99 × 10,900.34
4. Step 4: Simplify right side
   12,985.10x = 211,946,101.96
5. Step 5: Solve for x
   x = 211,946,101.96/12,985.10
6. Step 6: Final answer
   x = 16,322.25