Finding the Fourth Proportional to 38,490,816.56, 57,744,842.82 and 12,931,128.86

Step by Step Solution

1. Step 1: Write the proportion equation
   38,490,816.56 : 57,744,842.82 = 12,931,128.86 : x
2. Step 2: Convert to fraction form
   38,490,816.56/57,744,842.82 = 12,931,128.86/x
3. Step 3: Cross multiply
   38,490,816.56x = 57,744,842.82 × 12,931,128.86
4. Step 4: Simplify right side
   38,490,816.56x = 746,706,003,217,141.62
5. Step 5: Solve for x
   x = 746,706,003,217,141.62/38,490,816.56
6. Step 6: Final answer
   x = 19,399,588.53