Finding the Fourth Proportional to 419,123.10, 628,678.47 and 103,579.98

Step by Step Solution

1. Step 1: Write the proportion equation
   419,123.10 : 628,678.47 = 103,579.98 : x
2. Step 2: Convert to fraction form
   419,123.10/628,678.47 = 103,579.98/x
3. Step 3: Cross multiply
   419,123.10x = 628,678.47 × 103,579.98
4. Step 4: Simplify right side
   419,123.10x = 65,118,503,349.03
5. Step 5: Solve for x
   x = 65,118,503,349.03/419,123.10
6. Step 6: Final answer
   x = 155,368.44