Finding the Fourth Proportional to 42,931.89, 64,390.55 and 11,342.30

Step by Step Solution

1. Step 1: Write the proportion equation
   42,931.89 : 64,390.55 = 11,342.30 : x
2. Step 2: Convert to fraction form
   42,931.89/64,390.55 = 11,342.30/x
3. Step 3: Cross multiply
   42,931.89x = 64,390.55 × 11,342.30
4. Step 4: Simplify right side
   42,931.89x = 730,336,556.60
5. Step 5: Solve for x
   x = 730,336,556.60/42,931.89
6. Step 6: Final answer
   x = 17,011.52