Finding the Fourth Proportional to 42,128,145.15, 59,059,029.45 and 42,128,145.15

Step by Step Solution

1. Step 1: Write the proportion equation
   42,128,145.15 : 59,059,029.45 = 42,128,145.15 : x
2. Step 2: Convert to fraction form
   42,128,145.15/59,059,029.45 = 42,128,145.15/x
3. Step 3: Cross multiply
   42,128,145.15x = 59,059,029.45 × 42,128,145.15
4. Step 4: Simplify right side
   42,128,145.15x = 2,488,047,365,087,724.50
5. Step 5: Solve for x
   x = 2,488,047,365,087,724.50/42,128,145.15
6. Step 6: Final answer
   x = 59,059,029.45