Finding the Fourth Proportional to 52,419.40, 78,444.42 and 42,945.64

Step by Step Solution

1. Step 1: Write the proportion equation
   52,419.40 : 78,444.42 = 42,945.64 : x
2. Step 2: Convert to fraction form
   52,419.40/78,444.42 = 42,945.64/x
3. Step 3: Cross multiply
   52,419.40x = 78,444.42 × 42,945.64
4. Step 4: Simplify right side
   52,419.40x = 3,368,845,821.33
5. Step 5: Solve for x
   x = 3,368,845,821.33/52,419.40
6. Step 6: Final answer
   x = 64,267.16