Finding the Fourth Proportional to 42,722.34, 64,094.45 and 13,140.43

Step by Step Solution

1. Step 1: Write the proportion equation
   42,722.34 : 64,094.45 = 13,140.43 : x
2. Step 2: Convert to fraction form
   42,722.34/64,094.45 = 13,140.43/x
3. Step 3: Cross multiply
   42,722.34x = 64,094.45 × 13,140.43
4. Step 4: Simplify right side
   42,722.34x = 842,228,633.61
5. Step 5: Solve for x
   x = 842,228,633.61/42,722.34
6. Step 6: Final answer
   x = 19,714.01