Finding the Fourth Proportional to 78,505.31, 117,729.47 and 42,993.02

Step by Step Solution

1. Step 1: Write the proportion equation
   78,505.31 : 117,729.47 = 42,993.02 : x
2. Step 2: Convert to fraction form
   78,505.31/117,729.47 = 42,993.02/x
3. Step 3: Cross multiply
   78,505.31x = 117,729.47 × 42,993.02
4. Step 4: Simplify right side
   78,505.31x = 5,061,544,977.13
5. Step 5: Solve for x
   x = 5,061,544,977.13/78,505.31
6. Step 6: Final answer
   x = 64,473.92