Finding the Fourth Proportional to 12,978,638.32, 19,457,459.34 and 7,928,242.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978,638.32 : 19,457,459.34 = 7,928,242.96 : x
2. Step 2: Convert to fraction form
   12,978,638.32/19,457,459.34 = 7,928,242.96/x
3. Step 3: Cross multiply
   12,978,638.32x = 19,457,459.34 × 7,928,242.96
4. Step 4: Simplify right side
   12,978,638.32x = 154,263,465,031,841.25
5. Step 5: Solve for x
   x = 154,263,465,031,841.25/12,978,638.32
6. Step 6: Final answer
   x = 11,885,951.46