Finding the Fourth Proportional to 13,355.72, 18,430.34 and 7,387.01

Step by Step Solution

1. Step 1: Write the proportion equation
   13,355.72 : 18,430.34 = 7,387.01 : x
2. Step 2: Convert to fraction form
   13,355.72/18,430.34 = 7,387.01/x
3. Step 3: Cross multiply
   13,355.72x = 18,430.34 × 7,387.01
4. Step 4: Simplify right side
   13,355.72x = 136,145,071.83
5. Step 5: Solve for x
   x = 136,145,071.83/13,355.72
6. Step 6: Final answer
   x = 10,193.76