Finding the Fourth Proportional to 3,692.07, 5,538.20 and 918.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,692.07 : 5,538.20 = 918.72 : x
2. Step 2: Convert to fraction form
   3,692.07/5,538.20 = 918.72/x
3. Step 3: Cross multiply
   3,692.07x = 5,538.20 × 918.72
4. Step 4: Simplify right side
   3,692.07x = 5,088,050.51
5. Step 5: Solve for x
   x = 5,088,050.51/3,692.07
6. Step 6: Final answer
   x = 1,378.10