Finding the Fourth Proportional to 86,621,146.72, 129,888,486.72 and 28,321,230.64

Step by Step Solution

1. Step 1: Write the proportion equation
   86,621,146.72 : 129,888,486.72 = 28,321,230.64 : x
2. Step 2: Convert to fraction form
   86,621,146.72/129,888,486.72 = 28,321,230.64/x
3. Step 3: Cross multiply
   86,621,146.72x = 129,888,486.72 × 28,321,230.64
4. Step 4: Simplify right side
   86,621,146.72x = 3,678,601,789,877,697
5. Step 5: Solve for x
   x = 3,678,601,789,877,697/86,621,146.72
6. Step 6: Final answer
   x = 42,467,710.59