Finding the Fourth Proportional to 65,428.07, 90,288.55 and 38,570.09

Step by Step Solution

1. Step 1: Write the proportion equation
   65,428.07 : 90,288.55 = 38,570.09 : x
2. Step 2: Convert to fraction form
   65,428.07/90,288.55 = 38,570.09/x
3. Step 3: Cross multiply
   65,428.07x = 90,288.55 × 38,570.09
4. Step 4: Simplify right side
   65,428.07x = 3,482,437,499.47
5. Step 5: Solve for x
   x = 3,482,437,499.47/65,428.07
6. Step 6: Final answer
   x = 53,225.44