Finding the Fourth Proportional to 428,920.56, 643,383.27 and 113,374.13

Step by Step Solution

1. Step 1: Write the proportion equation
   428,920.56 : 643,383.27 = 113,374.13 : x
2. Step 2: Convert to fraction form
   428,920.56/643,383.27 = 113,374.13/x
3. Step 3: Cross multiply
   428,920.56x = 643,383.27 × 113,374.13
4. Step 4: Simplify right side
   428,920.56x = 72,943,015,275.89
5. Step 5: Solve for x
   x = 72,943,015,275.89/428,920.56
6. Step 6: Final answer
   x = 170,061.83