Finding the Fourth Proportional to 12,978,655.52, 19,470,082.80 and 5,406,386.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978,655.52 : 19,470,082.80 = 5,406,386.72 : x
2. Step 2: Convert to fraction form
   12,978,655.52/19,470,082.80 = 5,406,386.72/x
3. Step 3: Cross multiply
   12,978,655.52x = 19,470,082.80 × 5,406,386.72
4. Step 4: Simplify right side
   12,978,655.52x = 105,262,797,087,220.42
5. Step 5: Solve for x
   x = 105,262,797,087,220.42/12,978,655.52
6. Step 6: Final answer
   x = 8,110,454.66