Finding the Fourth Proportional to 12,899,352.69, 19,349,179.40 and 5,120,177.29

Step by Step Solution

1. Step 1: Write the proportion equation
   12,899,352.69 : 19,349,179.40 = 5,120,177.29 : x
2. Step 2: Convert to fraction form
   12,899,352.69/19,349,179.40 = 5,120,177.29/x
3. Step 3: Cross multiply
   12,899,352.69x = 19,349,179.40 × 5,120,177.29
4. Step 4: Simplify right side
   12,899,352.69x = 99,071,228,908,443.31
5. Step 5: Solve for x
   x = 99,071,228,908,443.31/12,899,352.69
6. Step 6: Final answer
   x = 7,680,325.62