Finding the Fourth Proportional to 42,964.55, 64,442.02 and 13,379.91

Step by Step Solution

1. Step 1: Write the proportion equation
   42,964.55 : 64,442.02 = 13,379.91 : x
2. Step 2: Convert to fraction form
   42,964.55/64,442.02 = 13,379.91/x
3. Step 3: Cross multiply
   42,964.55x = 64,442.02 × 13,379.91
4. Step 4: Simplify right side
   42,964.55x = 862,228,427.82
5. Step 5: Solve for x
   x = 862,228,427.82/42,964.55
6. Step 6: Final answer
   x = 20,068.37