Finding the Fourth Proportional to 85,433,145.30, 128,118,225.15 and 42,288,009.30

Step by Step Solution

1. Step 1: Write the proportion equation
   85,433,145.30 : 128,118,225.15 = 42,288,009.30 : x
2. Step 2: Convert to fraction form
   85,433,145.30/128,118,225.15 = 42,288,009.30/x
3. Step 3: Cross multiply
   85,433,145.30x = 128,118,225.15 × 42,288,009.30
4. Step 4: Simplify right side
   85,433,145.30x = 5,417,864,696,642,694
5. Step 5: Solve for x
   x = 5,417,864,696,642,694/85,433,145.30
6. Step 6: Final answer
   x = 63,416,425.53