Finding the Fourth Proportional to 13,290.10, 19,911.39 and 7,436.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,290.10 : 19,911.39 = 7,436.50 : x
2. Step 2: Convert to fraction form
   13,290.10/19,911.39 = 7,436.50/x
3. Step 3: Cross multiply
   13,290.10x = 19,911.39 × 7,436.50
4. Step 4: Simplify right side
   13,290.10x = 148,071,051.74
5. Step 5: Solve for x
   x = 148,071,051.74/13,290.10
6. Step 6: Final answer
   x = 11,141.46