Finding the Fourth Proportional to 42,742.72, 64,109.12 and 11,580.32

Step by Step Solution

1. Step 1: Write the proportion equation
   42,742.72 : 64,109.12 = 11,580.32 : x
2. Step 2: Convert to fraction form
   42,742.72/64,109.12 = 11,580.32/x
3. Step 3: Cross multiply
   42,742.72x = 64,109.12 × 11,580.32
4. Step 4: Simplify right side
   42,742.72x = 742,404,124.52
5. Step 5: Solve for x
   x = 742,404,124.52/42,742.72
6. Step 6: Final answer
   x = 17,369.14