Finding the Fourth Proportional to 74,922.58, 103,345.70 and 56,978.25

Step by Step Solution

1. Step 1: Write the proportion equation
   74,922.58 : 103,345.70 = 56,978.25 : x
2. Step 2: Convert to fraction form
   74,922.58/103,345.70 = 56,978.25/x
3. Step 3: Cross multiply
   74,922.58x = 103,345.70 × 56,978.25
4. Step 4: Simplify right side
   74,922.58x = 5,888,457,131.03
5. Step 5: Solve for x
   x = 5,888,457,131.03/74,922.58
6. Step 6: Final answer
   x = 78,593.89