Finding the Fourth Proportional to 103,758.98, 155,538.83 and 66,213.05

Step by Step Solution

1. Step 1: Write the proportion equation
   103,758.98 : 155,538.83 = 66,213.05 : x
2. Step 2: Convert to fraction form
   103,758.98/155,538.83 = 66,213.05/x
3. Step 3: Cross multiply
   103,758.98x = 155,538.83 × 66,213.05
4. Step 4: Simplify right side
   103,758.98x = 10,298,699,715.57
5. Step 5: Solve for x
   x = 10,298,699,715.57/103,758.98
6. Step 6: Final answer
   x = 99,255.99