Finding the Fourth Proportional to 28,965,300.08, 39,972,128.75 and 15,913,399.57

Step by Step Solution

1. Step 1: Write the proportion equation
   28,965,300.08 : 39,972,128.75 = 15,913,399.57 : x
2. Step 2: Convert to fraction form
   28,965,300.08/39,972,128.75 = 15,913,399.57/x
3. Step 3: Cross multiply
   28,965,300.08x = 39,972,128.75 × 15,913,399.57
4. Step 4: Simplify right side
   28,965,300.08x = 636,092,456,382,667.62
5. Step 5: Solve for x
   x = 636,092,456,382,667.62/28,965,300.08
6. Step 6: Final answer
   x = 21,960,499.45