Finding the Fourth Proportional to 13,290.51, 19,940.30 and 8,354.37

Step by Step Solution

1. Step 1: Write the proportion equation
   13,290.51 : 19,940.30 = 8,354.37 : x
2. Step 2: Convert to fraction form
   13,290.51/19,940.30 = 8,354.37/x
3. Step 3: Cross multiply
   13,290.51x = 19,940.30 × 8,354.37
4. Step 4: Simplify right side
   13,290.51x = 166,588,602.34
5. Step 5: Solve for x
   x = 166,588,602.34/13,290.51
6. Step 6: Final answer
   x = 12,534.40