Finding the Fourth Proportional to 9,990,067.96, 13,786,293.72 and 5,406,390.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,990,067.96 : 13,786,293.72 = 5,406,390.28 : x
2. Step 2: Convert to fraction form
   9,990,067.96/13,786,293.72 = 5,406,390.28/x
3. Step 3: Cross multiply
   9,990,067.96x = 13,786,293.72 × 5,406,390.28
4. Step 4: Simplify right side
   9,990,067.96x = 74,534,084,365,033.05
5. Step 5: Solve for x
   x = 74,534,084,365,033.05/9,990,067.96
6. Step 6: Final answer
   x = 7,460,818.55