Finding the Fourth Proportional to 128,136,819.78, 176,844,342.69 and 72,384,591.06

Step by Step Solution

1. Step 1: Write the proportion equation
   128,136,819.78 : 176,844,342.69 = 72,384,591.06 : x
2. Step 2: Convert to fraction form
   128,136,819.78/176,844,342.69 = 72,384,591.06/x
3. Step 3: Cross multiply
   128,136,819.78x = 176,844,342.69 × 72,384,591.06
4. Step 4: Simplify right side
   128,136,819.78x = 12,800,805,426,890,150
5. Step 5: Solve for x
   x = 12,800,805,426,890,150/128,136,819.78
6. Step 6: Final answer
   x = 99,899,509.36