Finding the Fourth Proportional to 12,921,700.82, 17,832,066.71 and 7,120,690.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,921,700.82 : 17,832,066.71 = 7,120,690.16 : x
2. Step 2: Convert to fraction form
   12,921,700.82/17,832,066.71 = 7,120,690.16/x
3. Step 3: Cross multiply
   12,921,700.82x = 17,832,066.71 × 7,120,690.16
4. Step 4: Simplify right side
   12,921,700.82x = 126,976,621,829,596.78
5. Step 5: Solve for x
   x = 126,976,621,829,596.78/12,921,700.82
6. Step 6: Final answer
   x = 9,826,618.31